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US8101252B1 - Air bag - Google Patents

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Publication number
US8101252B1
US8101252B1 US09/530,447 US53044798A US8101252B1 US 8101252 B1 US8101252 B1 US 8101252B1 US 53044798 A US53044798 A US 53044798A US 8101252 B1 US8101252 B1 US 8101252B1
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US
United States
Prior art keywords
air bag
fabric
range
decitex
fineness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US09/530,447
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English (en)
Inventor
Yoshinori Kami
Hideaki Ishii
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Asahi Kasei Corp
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Asahi Kasei Corp
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Filing date
Publication date
Application filed by Asahi Kasei Corp filed Critical Asahi Kasei Corp
Assigned to ASAHI KASEI KOGYO KASBUSHIKI KAISHA reassignment ASAHI KASEI KOGYO KASBUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISHII, HIDEAKI, KAMI, YOSHINORI
Assigned to ASAHI KASEI KABUSHIKI KAISHA reassignment ASAHI KASEI KABUSHIKI KAISHA CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ASAHI KASEI KOGYO KABUSHIKI KAISHA
Application granted granted Critical
Publication of US8101252B1 publication Critical patent/US8101252B1/en
Adjusted expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/235—Inflatable members characterised by their material
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D03D1/02—Inflatable articles
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D03D15/41—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads with specific twist
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/573—Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/235—Inflatable members characterised by their material
    • B60R2021/23504—Inflatable members characterised by their material characterised by material
    • B60R2021/23509—Fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/235—Inflatable members characterised by their material
    • B60R2021/23533—Inflatable members characterised by their material characterised by the manufacturing process
    • B60R2021/23542—Weaving
    • B60R2021/23547—Weaving one piece weaving
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/12—Vehicles
    • D10B2505/124—Air bags
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T428/1307—Bag or tubular film [e.g., pouch, flexible food casing, envelope, etc.]
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    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1362—Textile, fabric, cloth, or pile containing [e.g., web, net, woven, knitted, mesh, nonwoven, matted, etc.]
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    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
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    • Y10T428/2958—Metal or metal compound in coating
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    • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2631—Coating or impregnation provides heat or fire protection
    • Y10T442/2639—Coated or impregnated asbestos fabric
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    • Y10T442/3065—Including strand which is of specific structural definition
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Definitions

  • the present invention relates to an air bag for the protection of vehicle occupants upon the collision of a vehicle, by preventing the car occupants from secondarily colliding with an interior structure of the vehicle.
  • the air bag is usually housed in a narrow space such as an interior space of a steering wheel or an instrument panel.
  • the steering wheel is designed to have a larger opening so that a speedometer or other instruments is easily visible, which, however, strongly requires that the air bag has a volume as small as possible to be housed in such a steering wheel.
  • a woven fabric for an air bag has an excellent mechanical property and is durable against the deployment of the air bag caused by a sudden expansion of a gas and a good foldability so that the air bag is foldable as compact as possible to be housed in a mounting case. Efforts to obtain such an air bag excellent in mechanical performance and having a compact volume, are continuing.
  • a prior art air bag is generally prepared from a woven fabric composed of polyamide type yarns to have a weave density in a range from 24 to 32 ends/2.54 cm if a total yarn fineness is 933 decitex or in a range from 46 to 55 ends/2.54 cm if a total yarn fineness is 467 decitex, which fabric is then coated with a synthetic rubber such as chloroprene rubber or silicone rubber and sewn together to form the air bag.
  • a synthetic rubber such as chloroprene rubber or silicone rubber
  • the coated fabric is thick and heavy and, in addition, has a high rigidity, whereby the air bag formed of such a fabric may injure a vehicle occupant when an air bag device operates to deploy and inflate the air bag. There are reports that this is particularly dangerous when the vehicle occupant is an infant.
  • the air bag device is usually mounted to a central region of a steering wheel for a driver's seat and to an inner wall of an instrument panel for a passenger's seat. If the air bag is heavy in weight, it is necessary to strengthen a mount thereof so that the mount can bear the weight.
  • the woven fabric for the air bag has a large thickness and a high rigidity, the volume of the folded air bag becomes larger to need a larger space therefor.
  • woven fabrics having no resinous coating have recently been used.
  • some air bags use a woven fabric composed of thinner yarns such as one having a fineness of 350 decitex or 233 decitex.
  • the air bags obtained from such woven fabrics are insufficient for the reduction of the fabric thickness and weight, and therefore there is still a strong desire for obtaining a lighter and more pliable fabric.
  • U.S. Pat. No. 5,533,755 proposes an inflatable protective cushion (air bag) using a woven fabric composed of yarns having a fineness less than 467 decitex.
  • An air cushion is disclosed as Example 1 thereof formed of a woven fabric composed of nylon yarns of 50 decitex which is compacted through a special scour and then calendered. While the fabric of this kind certainly has a much smaller fabric thickness and weight relative to the prior art woven fabric, usually the tensile strength thereof is also reduced to the same extent.
  • the air bag is not durable against stress and/or an inner pressure generated upon inflation and deployment of the air bag unless it is converted to a specially strengthened fabric through a compaction treatment or a calendering as disclosed in the above-mentioned United States Patent.
  • the United States Patent also proposes, in addition to the strengthening of the fabric described above, the improvement in a cut shape and a position of seams of the air bag fabric. For example, it is usual in the conventional air bag for a driver's seat that two circular pieces of about 70 cm diameter are cut from the fabric and sewn together along the periphery thereof.
  • the present invention is directed to an air bag free from the above-mentioned problems, which is light in weight and is compact to be housed in an air bag case, while having properties satisfying the necessary and sufficient conditions upon the actuation of air bag as well as being durable against long term aging.
  • a typical woven fabric used which is composed of nylon 66 yarns of 467 decitex to have a weave density of 53 ends/2.54 cm has a fabric thickness of 0.32 mm and a basis weight of 204 g/m 2
  • another woven fabric composed of nylon 66 yarns of 350 decitex to have a weave density of 60 ends/2.54 cm has a fabric thickness of 0.28 mm and a basis weight of 170 g/m 2 , which means that even if the yarn fineness decreases from 467 decitex to 350 decitex, the reduction of the fabric thickness is at most about 13% and that of the weight is about 17%.
  • the air bag for a driver's seat formed of such a fabric has a weight exceeding about 200 g and a thickness in a folded state exceeding about 20 mm.
  • the present invention has been based on a view that for the purpose of drastically reducing weight and volume of an air bag, it is necessary to decrease the basis weight and thickness of a woven fabric used therefor by about 20%, preferably by 30% or more.
  • the present inventors have paid attention to a dynamic load applied to the air bag at each of the operating stages and found that the tenacity of the air bag; i.e., the performance thereof durable against dynamic stress relies not only on a mechanical strength of a fabric forming the air bag but that the amount of a tensile work at break of the fabric forming the air bag is also an extremely important factor.
  • an air bag formed of two woven fabrics interwoven with each other to be a bag-shaped body, each composed of polyamide type fiber yarns containing copper compounds at 30 to 200 ppm estimated in terms of copper wherein the fabric is structured so that a product of a total fineness of warp or weft of the fabric multiplied by a weave density of the fabric is not more than 16000 decitex ⁇ ends/2.54 cm, a load at a 15% tensile elongation is in a range from 3 to 35 N/%/2.54 cm, and a tensile work at break is in a range from 7000 to 30000 N ⁇ %/2.54 cm.
  • an air bag formed of a woven fabric composed of polyamide type fiber yarns containing copper compounds at 30 to 200 ppm, estimated in term of copper wherein the fabric has a product of a total fineness of warp or weft of the fabric multiplied by a weave density of the fabric of not more than 16000 decitex ⁇ ends/2.54 cm, a load at a 15% elongation in a range from 3 to 35 N/%/2.54 cm, and a tensile work at break in a range from 7000 to 30000 N ⁇ %/2.54 cm, and wherein the fabric is sewn or bonded to have a three-dimensional contour.
  • Air bags according to the present invention are those formed of two woven fabric pieces, each composed of polyamide type synthetic fiber yarns, to be a bag-shaped body. They include air bags for a driver's seat, for a passenger's seat and for side impact protection of a vehicle occupant.
  • the bag-shaped body may be prepared by sewing or bonding two fabric pieces together or may be woven into a fabric and cut therefrom.
  • the air bag formed of two woven fabrics of the present invention may be a bag-shaped body which is manufactured by sewing two fabrics having the same weave or different weaves or one woven on a loom as a hollow weave while using a stitch yarn. If the hollow air bag is formed of the above-mentioned fabrics satisfying the conditions defined by the specified yarn, weave structure and tensile work at break, it is possible for the woven fabric to generally uniformly bear an expansion stress caused by a gas generated upon the deployment of the air bag, whereby the air bag could, as a whole, have an extremely high mechanical resistance to an instantaneous expansion stress upon deployment.
  • the air bag according to the present invention may be formed by sewing or bonding one or three cut pieces, or more, of the above-mentioned woven fabric together to have a three-dimensional contour.
  • the above-mentioned air bag formed by sewing or bonding one or three cut pieces, or more, of the woven fabric to have a three-dimensional contour may be the one disclosed in Japanese Patent No. 2,668,332 wherein three main pieces of the fabric are cut from a woven fabric and then sewn together along the outer periphery to have a three-dimensional contour, or may be one disclosed in U.S. Pat. No. 5,529,340 wherein a single piece is cut from a woven fabric, which is patterned to have a three-dimensional contour after the cut edges thereof are sewn together.
  • the air bag according to the present invention is excellent in weight reduction and pliability so that a favorable compactness is obtainable if the fabric is composed of yarns (warp and weft), each consisting of a plurality of filaments having a total fineness in a range from 66 to 167 decitex and a single filament fineness in a range from 1.0 to 3.3 decitex, and has the above-identified tensile work at break.
  • a resistance to heat-aging, a resistance to wet heat-aging and a resistance to ozone of the air bag could be improved to a large extent if a woven fabric composed of polyamide fiber yarns containing a predetermined amount of copper salt (copper acetate, halogenated copper, copper bromide or others), halogenated alkaline metals or mixtures of various copper salts and organic bases is used.
  • copper salt copper acetate, halogenated copper, copper bromide or others
  • FIG. 1 is a conceptual illustration of a sequence of behaviours of an air bag upon the inflation
  • FIG. 2 is a tensile stress-strain curve of a woven fabric constituting the air bag, for illustrating a tensile work at break thereof;
  • FIG. 3 is an illustration of a method for measuring a thickness of the air bag.
  • an air bag is formed of a woven fabric having a tensile work at break of 7000 (N ⁇ %/2.54 cm) or more.
  • the tensile work at break referred to in this text is defined by an area encircled with a tensile stress-strain curve shown in FIG. 2 of the woven fabric of the air bag obtained by a tensile test carried out under a predetermined condition and a vertical line extending from a break point on the tensile stress-strain curve to a horizontal axis (representing a tensile elongation).
  • FIG. 1 is a schematic illustration of a sequence of typical behaviours of the air bag upon the collision of a vehicle.
  • FIG. 1 ( 1 ) shows the air bag housed in a case 1 in a folded state before the same is actuated.
  • a gas for inflating the air bag 2 is supplied thereinto.
  • the case opens as shown in FIG. 1 ( 2 ) to allow the air bag to project forward (in the direction opposite to the mount).
  • the air bag vibrates forward and backward due to the elastic recovery of the woven fabric and the inner pressure as shown in FIGS. 1 ( 3 ) and 1 ( 4 ), the air bag expands to a maximum extent and reaches a generally stable profile.
  • a load applied to the woven fabric of the air bag is a hoop tension due to the inner pressure of the air bag
  • the present inventors have analyzed the sequence of behaviours of the air bag from the stage wherein the air bag starts the inflation to the stage wherein the inflated air bag absorbs the inertial kinetic motion of the vehicle occupant caused by a sudden stop of the vehicle, and found that the dynamic load applied to the air bag becomes larger at the stage shown in FIG. 1 ( 3 ) wherein the air bag is supplied with gas from the inflator to project forward to a maximum extent than at the stage shown in FIGS. 1 ( 5 ) and 1 ( 6 ) wherein the air bag inflates to a maximum extent and restrains the occupant.
  • the woven fabric of the air bag preferably has a larger tensile work.
  • the tensile work at break of the woven fabric is 7000 (N ⁇ %/2.54 cm) or more, preferably 15000 (N ⁇ %/2.54 cm) or more, most preferably 25000 (N ⁇ %/2.54 cm) or more if the deployment at a high temperature or a safety factor is taken into consideration. If this value is less than 7000 (N ⁇ %/2.54 cm), there is a risk in that the air bag may be broken in the mount or the outer periphery thereof at the deployment stage of the air bag.
  • the air bag according to the present invention has to be formed of a woven fabric having a product of a total fineness of warp or weft multiplied by a weave density (hereinafter referred to as a weave fineness) of 16000 (decitex ⁇ ends/2.54 cm) or less and a tensile work at break of 7000 (N ⁇ %/2.54 cm) or more.
  • a load at a 15% elongation is in a range from 3 to 35 N/%/2.54 cm when the woven fabric is stretched. If the load at a 15% elongation exceeds 35 N/%/2.54 cm, the woven fabric is too rigid to obtain a pliable air bag. Contrarily, if it is less than 3 N/%/2.54 cm, the woven fabric is liable to be largely stretched to cause a so-called bottoming when the air bag restrains the vehicle occupant.
  • the vehicle may be used under various conditions for a long period, one of important requisites for the air bag is that the performance thereof does not deteriorate even after being exposed to high temperature, moisture or ozonic. Particularly, the resistance to heat is an important factor.
  • automobile manufacturers regard such a fact as important as the loss of the tensile strength of the woven fabric is small after being subjected to a high temperature (in a range from 80 to 120° C.) treatment for a long period (in a range from 1000 to 3000 hours).
  • yarns are used for forming the woven fabric for the air bag have a total yarn fineness in a range from 66 to 167 decitex and are composed of a plurality of single filaments, each having a fineness in a range from 1.0 to 3.3 decitex. If the yarns having a total yarn fineness exceeding 167 decitex or a single filament fineness exceeding 3.3 decitex, are used, the resultant woven fabric becomes stiff and produces an air bag having poor stowability. Contrarily, yarns having a single filament fineness less than 1.0 decitex are difficult to produce and, even if it is possible, the weaving process would be troublesome.
  • the air bag obtained from yarns having a total thickness less than 66 decitex has an inferior mechanical property such as a tensile strength or a tearing strength and may not satisfy the indispensably dynamic characteristics of the air bag indispensable upon the actuation thereof.
  • the woven fabric for the air bag according to the present invention preferably has substantially the same mechanical property in the warp and weft directions.
  • the mechanical property in the weft direction is sometimes inferior to that in the warp direction as a result of the treatment direction in a fabric finishing process.
  • the woven fabric is preferably prepared so that a birefringence of weft is larger than that of warp, or a weave fineness in weft is larger than that in warp in the resultant fabric.
  • yarns for the air bag according to the present invention must contain one kind or more stabilizing agents for improving the durability.
  • the durability referred to herein includes a resistant to aging, a resistant to wet heat aging, a resistance to ozone or others.
  • yarn forming the woven fabric contains a copper compound selected from a group consisting of copper salt and a halogenated copper in a mixture with a halogenated alkaline metal as the stabilizing agents for improving the heat durability.
  • the copper salt includes, for example, copper acetate
  • the halogenated copper includes, for example, copper bromide.
  • Yarns forming the air bag of the present invention are composed of polyamide fibers containing copper or copper compounds of 30 to 200 ppm estimated in term of copper. If the value estimated in term of copper is less than 30 ppm, there is a risk of a lack of the heat durability expected of the air bag fabric of the present invention, while if it exceeds 200 ppm, there is a risk of difficulty in the spinning process.
  • the air bag fabric of the present invention may be woven in any of conventional weaves including a plain weave, a rip-stop weave, a mat weave, a twill weave or others.
  • a plain weave is particularly favorably used for the air bag fabric according to the present invention, because a denser weave structure is easily obtainable.
  • the warp and weft density may be adjustable even after the weaving process through the fabric finishing process.
  • the air bag of the present invention may be manufactured by a conventional air bag-forming method.
  • the air bag according to the present invention While constituent features of the air bag according to the present invention have been described above mainly with reference to an air bag for a driver's seat, these means and methods may be also applicable in a similar manner to that for a passenger's seat or a side impact protection air bag. This is apparent because, even though a bag structure and shape, a deployment speed and a mounting position are different from the former, the deployment kinetic energy of the air bag itself is absorbed by a tensile work of the woven fabric.
  • the air bag may be coated with synthetic rubber or others, or may be of a so-called non-coated type.
  • the yarn tensile strength and elongation at break were measured by an Autograph S-100 Type manufactured by Shimadzu Seisakusho K.K. under the condition of a grip yarn length of 20 cm and a stretching speed of 20 cm/min.
  • the tensile work at break was an integrated value from the initiation to a breakage point in a tensile stress-strain curve obtained by this measurement divided by a measured yarn fineness and unit-converted to cN ⁇ cm/decitex.
  • the measurement was carried out by means of a polarizing microscope of the XTP-11 type manufactured by Nikon K.K., wherein a conventional Bereck compensator method is adopted while using white light as a light source.
  • the fabric tensile strength and elongation at break were measured by an AG 1000D manufactured by Shimadzu Seisakusho K.K., under the condition of a test piece width of 2.54 cm, a fabric grip length of 20 cm and a stretching speed of 20 cm/min while adopting a raveled-strip method.
  • the tensile work at break was an integrated value from the initiation to a breakage point in a tensile stress-strain curve obtained by this measurement divided by the fabric grip length and unit-converted to N ⁇ %/2.54 cm.
  • a load at 15% elongation is a load value at 15% on the tensile stress-strain curve obtained by this measurement, which is then divided by 15 and unit-converted to N/%/2.54 cm.
  • the retention of resistance to heat was calculated by dividing a tensile strength value obtained in the above manner prior to a heat treatment of the fabric (at 110° C. for 1000 hours) with a value after the heat treatment.
  • the air bag was first folded so that edges a and b are brought into contact with each other, and then folded so that a distance between edges c and d is equally divided.
  • the folded air bag shown in FIG. 3(B) was placed on a flat table and loaded with a weight of 1 kg via a glass plate of 300 mm square. After 30 minutes, a thickness X was measured. The measured value is divided by an X value of an air bag in Comparative Example 4 which corresponds to a prior art one and shown in a Table.
  • Polyhexamethylene adipamide chips having a relative viscosity of 60 relative to 90% formic acid were molten in an extruder type spinning machine.
  • the chips had no titanium oxide but contained copper acetate and potassium iodide of 1:12 in an additive ratio as a copper type heat-stabilizing agent so that copper is contained at 65 ppm in the polymer.
  • the molten polymer was filtered and extruded from a spinneret having nozzles of 0.25 mm diameter.
  • the extruded molten polymer was quenched and solidified into a fibrous yarn, to which is imparted an oil at 1.0% by weight.
  • the yarn was taken up by a takeup roll and immediately thereafter passed to a hot roll for the purpose of carrying out the drawing operation between both the rolls. These steps were continuously carried out by a direct spin-draw machine.
  • the yarn was subjected to an interlacing treatment immediately before being wound on a bobbin at a winding speed of 4000 m/min to have interlaced portions in a range from 10 to 30 points/m.
  • the resultant polyhexamethylene adipamide yarn has a yarn fineness of 78 decitex/35 filaments, a tensile strength of 7.1 cN/dtex, a tensile work at break of 16.3 cN ⁇ cm/decitex and a birefringence of 56 ⁇ n/1000.
  • a greige fabric was woven from the yarns thus obtained, wherein warp was prepared by doubling two of the yarns at a twist of 200 turns/m and sizing with acrylic sizing agent, while weft is inserted into the same shedding.
  • the greige was scoured and set to result in an air bag fabric having a weave density in warp of 95 and in weft of 93 ends/2.54 cm estimated in term of 156 decitex, a weave fineness of 14820 decitex ⁇ ends/2.54 cm in warp and 14508 decitex ⁇ ends/2.54 cm in tensile work at break in warp of 20500 and in weft of 13500 N ⁇ %/2.54 cm.
  • the air bag was compactly foldable.
  • the deployment test was carried out at 85° C. while mounting thereto an inflator (Type 8) manufactured by Morton International, which showed that no damage occurs to the air bag.
  • the woven fabric was subjected to a heat treatment at 110° C. for 1000 hours, and thereafter the retention of strength was measured. The value obtained was 95% which means that a resistance to heat is sufficient.
  • Yarns having a tensile strength of 6.3 cN/decitex and a tensile work at break of 23.9 cN ⁇ cm/decitex were prepared in the same manner as in Example 1.
  • a fabric having a tensile work at break in warp of 20600 and in weft of 14500 N ⁇ cm/decitex was woven from the yarns in the same manner as in Example 1.
  • the air bag was compactly foldable.
  • the deployment test was carried out at 85° C. while mounting thereto an inflator (Type 8) manufactured by Morton International, which showed that no damage occurs to the air bag.
  • Yarns having a tensile strength of 5.4 cN/decitex and a tensile work at break of 26.0 cN ⁇ cm/decitex were prepared in the same manner as in Example 1.
  • a fabric having a tensile work at break in warp of 17500 and in weft of 13600 N ⁇ cm/dTex was woven from the yarns in the same manner as in Example 1.
  • the air bag was compactly foldable.
  • the deployment test was carried out at 85° C. while mounting thereto an inflator (Type 8) manufactured by Morton International. As a result, it was confirmed that no damage occurs to the air bag upon deployment.
  • a fabric was woven from yarns prepared in Example 1 to have a weave density in warp of 90 and in weft of 98 ends/2.54 cm. This fabric was a balanced one having tensile strength in warp of 963 N/2.54 cm and in weft of 983 N/2.54 cm.
  • the air bag was compactly foldable.
  • the deployment test was carried out at 85° C. while mounting thereto an inflator (Type 8) manufactured by Morton International, which showed that no damage occurs to the air bag.
  • Yarns having a tensile strength of 6.7 cN/decitex and 7.1 cN/decitex were prepared in the same manner as in Example 1, and a fabric having a weave density both in warp and weft of 94 ends/2.54 cm was woven therefrom, which had a balanced tensile strength both in warp and weft; i.e., that in warp being 951 and that in weft being 941 N/2.54 cm.
  • the air bag was compactly foldable.
  • the deployment test was carried out at 85° C. while mounting thereto an inflator (Type 8) manufactured by Morton International, which showed that no damage occurs to the air bag.
  • Yarns were prepared in the same manner as in Example 1. A fabric was woven from these single yarns without doubling the same so that a weaving density is 142 ends/2.54 cm both in warp and weft, a weave fineness is 11076 decitex ⁇ ends/2.54 cm and a tensile work at break is 12500 N ⁇ %/2.54 cm in warp and 8000 N ⁇ %/2.54 cm in weft.
  • the air bag was compactly foldable.
  • the deployment test was carried out at 85° C. while mounting thereto an inflator manufactured by Morton International, which showed that no damage occurs to the air bag.
  • a fabric was woven in the same manner as in Example 1 from yarns prepared in the same manner as in Example 1 except that no copper compounds were added to the polymer. A retention of a resistance to heat of this fabric was as low as 48%.
  • a fabric was woven in the same manner as in Example 1 from yarns prepared in the same manner as in Example 1 except that copper compounds of 10 ppm estimated in term of copper were added to the polymer. A retention of a resistance to heat of this fabric was as low as 70%.
  • Yarns having a fineness of 56 decitex were prepared in the same manner as in Example 1, and a fabric was woven from the yarns thus prepared, which had a weave density in warp of 192 and in weft of 190 ends/2.54 cm, and a tensile work at break in warp of 6000 and in weft of 5900 N ⁇ %/2.54 cm.
  • the air bag was compactly foldable.
  • the deployment test carried out at 85° C. while mounting thereto an inflator (Type 8) manufactured by Morton International, however, showed that the air bag was seriously damaged.
  • Yarns having a fineness of 233 decitex were prepared in the same manner as in Example 1, and a fabric was woven from the yarns, thus prepared, which had a weave density in warp of 78 and in weft of 75 ends/2.54 cm, and a tensile work at break in warp of 30000 and in weft of 26000 N ⁇ %/2.54 cm.
  • Example 1 Example 2
  • Example 3 Example 4
  • Example 5 Polymer Description Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Relative viscosity to 60 60 60 60 60 60 60 60 60 60 formic acid Addition amount of 0 0 0 0 0 0 titanium oxide (ppm) Addition amount of copper 65 65 65 65 65 65 (ppm) Yarn Fineness of yarn (dTex) 78 78 78 78 78 78 78 78 Number of filament 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 Tensile strength 7.1 6.3 5.4 7.1 6.7 ⁇ 7.1
  • the present invention provides an air bag which is very exceptionally light and pliable to be compactly housed in a air bag case, having a performance necessary and sufficient for the actuation of the air bag and excellent in durability against aging in the long term.
  • the air bag according to the present invention is suitable for all kinds of air bags for protecting a vehicle occupant including those for a driver's seat, a passenger's seat and a side impact protection which have exceptionally light weight and good performance in use.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)
  • Woven Fabrics (AREA)
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WO2001009416A1 (fr) * 1999-08-02 2001-02-08 Asahi Kasei Kabushiki Kaisha Textile de base pour coussin gonflable de securite
JP4493798B2 (ja) * 2000-04-07 2010-06-30 旭化成せんい株式会社 エアバッグ用コーティング組成物およびエアバッグ
US6832778B2 (en) * 2002-07-19 2004-12-21 Delphi Technologies, Inc. Air bag restraint including selectively operable venting elements
EP2264235B1 (fr) 2008-03-10 2021-06-09 Toray Industries, Inc. Tissu de base pour coussin de sécurité gonflable
US8642489B2 (en) * 2009-11-09 2014-02-04 Asahi Kasei Fibers Corporation Airbag fabric and airbag
ES2376215B1 (es) * 2009-11-26 2013-01-24 Dalphi Metal España, S.A Módulo airbag de retención para motoristas.
JP5707158B2 (ja) * 2011-02-03 2015-04-22 旭化成せんい株式会社 合成繊維からなる基布
CN116949697B (zh) * 2023-07-21 2025-10-03 华懋（厦门）新材料科技股份有限公司 一种一次成型的安全气囊导气袋自动缝纫设备及其制造工艺

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DE69826508D1 (de) 2004-10-28
EP1026049A1 (fr) 2000-08-09
EP1026049A4 (fr) 2001-01-31
WO1999022967A1 (fr) 1999-05-14
DE69826508T2 (de) 2005-09-29
EP1026049B1 (fr) 2004-09-22

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